Samsung SM-G889YB/DS User Manual page 21

Basics
1
Turn the screw anticlockwise with a coin or other objects to unlock the back cover, and
then remove the back cover.
2
Pull out the battery.
3
Insert the SIM or USIM card with the gold-coloured contacts facing downwards.
Do not insert a memory card into the SIM or USIM card slot.
4
Insert the battery.
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